CI: check dead links in docs

[Borda]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Fixes # (issue).

PR review

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[awaelchli]

nice tool! perfect as a ci job

[ethanwharris]

Neat!

[Borda]

I am fixing some dead links in the lectures and seems that one or more notebooks can't run again...
@phlippe mind have a look at what is happening there? 🐰

[phlippe]

Ah, the new PyTorch Geometric version broke our checkpoints by renaming some internal layers. I corrected the checkpoint, but we need to update the PyTorch Geometric. I will look into that tomorrow.

[Borda]

I will look into that tomorrow.

do you prefer to update the notebook/checkpoint or just freeze the package version?

[phlippe]

do you prefer to update the notebook/checkpoint or just freeze the package version?

I think in this case it made more sense to update the version in the meta file since we went from PyG 1.7 to 2.0. I do not expect more breaking changes any time soon.